Add configuration to flip the game content

YAMS-LIB/Program.cs

@@ -595,6 +595,9 @@ public static void Main(string am2rPath, string outputAm2rPath, string jsonPath)
         // Add in-game Hints
         AddInGameHints.Apply(gmData, decompileContext, seedObject);
 
+        // Flip game
+        FlippedGame.Apply(gmData, decompileContext, seedObject);
+
         // Add history log entry
         HistoryLogEntry.Apply(gmData, decompileContext, seedObject);
 

YAMS-LIB/SeedObject.cs

@@ -330,6 +330,15 @@ [JsonInclude] [JsonPropertyName("grave_grotto_blocks")]
     [JsonInclude]
     [JsonPropertyName("two_suits_damage_multiplier")]
     public double TwoSuitsDamageMultiplier = 0.25;
+
+    [JsonInclude]
+    [JsonPropertyName("flip_vertically")]
+    public bool FlipVertically;
+
+    [JsonInclude]
+    [JsonPropertyName("flip_horizontally")]
+    public bool FlipHorizontally;
+
 }
 
 public class ConfigurationIdentifier

YAMS-LIB/patches/misc/FlippedGame.cs

@@ -0,0 +1,169 @@
+using UndertaleModLib;
+using UndertaleModLib.Decompiler;
+using UndertaleModLib.Models;
+
+namespace YAMS_LIB.patches.misc;
+
+public class FlippedGame
+{
+    public static void Apply(UndertaleData gmData, GlobalDecompileContext decompileContext, SeedObject seedObject)
+    {
+        gmData.Code.ByName("gml_Object_oControl_Create_0").PrependGMLInCode($"global.flipGameVertically = {(seedObject.Patches.FlipVertically ? 1 : 0)}; global.flipGameHorizontally = {(seedObject.Patches.FlipHorizontally ? 1 : 0)};");
+
+        gmData.Scripts.AddScript("draw_surface_ext_flipped",
+            """
+            var surf = argument0;
+            var xCoord = argument1;
+            var yCoord = argument2;
+            var xScale = argument3;
+            var yScale = argument4;
+            var rot = argument5;
+            var col = argument6;
+            var alpha = argument7;
+
+            if (!(room == rm_loading || room == rm_controller || room == titleroom || room == rm_gameplay || room == rm_options || room == rm_gallery || room == rm_credits || (room == rm_transition && global.transitiontype != 1)))
+            {
+                // if flipped horizontal
+                if (global.flipGameHorizontally)
+                {
+                    xCoord = (surface_get_width(surf) * xScale) + xCoord;
+                    xScale *= -1;
+                }
+                // if flipped vertical
+                if (global.flipGameVertically)
+                {
+                    yCoord = (surface_get_height(surf) * yScale) + yCoord;
+                    yScale *= -1;
+                }
+            }
+            draw_surface_ext(surf, xCoord, yCoord, xScale, yScale, rot, col, alpha);
+            """);
+
+        gmData.Code.ByName("gml_Script_draw_game_surface").
+            ReplaceGMLInCode("draw_surface_ext(application_surface, argument0, argument1, argument2, argument2, 0, c_white, 1)",
+                "draw_surface_ext_flipped(application_surface, argument0, argument1, argument2, argument2, 0, c_white, 1)");
+
+        gmData.Code.ByName("gml_Object_oControl_Draw_77")
+            .ReplaceGMLInCode("draw_surface_ext(widescreen_surface, (displayx + xShake), (displayy + yShake), display_scale, display_scale, 0, c_white, 1)",
+            "draw_surface_ext_flipped(widescreen_surface, (displayx + xShake), (displayy + yShake), display_scale, display_scale, 0, c_white, 1)");
+
+        // Make logbook text look normal
+        gmData.Code.ByName("gml_Object_oLogScreenControl_Draw_0")
+            .ReplaceGMLInCode("draw_surface(surf, (view_wview[0] / 2 + 150 + widescreen_space), (view_yview[0] + 52))",
+                "draw_surface_ext_flipped(surf, (((view_wview[0] / 2) + 150) + widescreen_space), (view_yview[0] + 52), 1, 1, 0, c_white, 1);");
+
+        // Make popup text look normal
+        gmData.Code.ByName("gml_Object_oPopupText_Create_0").AppendGMLInCode("surf = surface_create(320 + 53 * oControl.widescreen, 240);");
+        gmData.GameObjects.ByName("oPopupText").EventHandlerFor(EventType.Destroy, gmData).SubstituteGMLCode("surface_free(surf)");
+        gmData.Code.ByName("gml_Object_oPopupText_Step_0").AppendGMLInCode("""
+        if (!surface_exists(surf))
+          surf = surface_create(320 + 53 * oControl.widescreen, 240);
+        surface_set_target(surf);
+        draw_set_font(global.fontGUI2);
+        draw_set_halign(fa_right);
+        draw_cool_text((316 + 53 * oControl.widescreen), (226), text, c_black, c_white, c_white, image_alpha);
+        draw_set_halign(fa_left);
+        surface_reset_target();
+        """);
+        gmData.Code.ByName("gml_Object_oPopupText_Draw_0").SubstituteGMLCode(
+            """
+            var flipAdjustment = 0
+            if (global.flipGameHorizontally)
+                flipAdjustment = -1
+            draw_surface_ext_flipped(surf, view_xview[0] + 53 * oControl.widescreen * flipAdjustment, view_yview[0], 1, 1, 0, c_white, 1);
+            """
+            );
+
+        // Make item cutscene look normal
+        gmData.Code.ByName("gml_Object_oItemCutscene_Create_0").PrependGMLInCode("item_surf = surface_create(320 + 53 * oControl.widescreen, 240);");
+        gmData.GameObjects.ByName("oItemCutscene").EventHandlerFor(EventType.Destroy, gmData).SubstituteGMLCode("surface_free(item_surf)");
+        gmData.Code.ByName("gml_Object_oItemCutscene_Draw_0").ReplaceGMLInCode("draw_set_alpha(0.8)",
+            """
+            if (!surface_exists(item_surf))
+                item_surf = surface_create(320 + 53 * oControl.widescreen, 240);
+            surface_set_target(item_surf)
+            draw_set_alpha(0.8)
+            """
+            );
+        gmData.Code.ByName("gml_Object_oItemCutscene_Draw_0").ReplaceGMLInCode("draw_set_alpha(1)", """
+            draw_set_alpha(1);
+            surface_reset_target();
+            var flipAdjustment = 0
+            if (global.flipGameHorizontally)
+                flipAdjustment = -1
+            draw_surface_ext_flipped(item_surf, view_xview[0] + 53 * oControl.widescreen * flipAdjustment, view_yview[0], 1, 1, 0, c_white, 1)
+            """);
+
+        // Flip minimap but keep in place
+        gmData.Code.ByName("gml_Object_oControl_Create_0").ReplaceGMLInCode("gui_surface = 0", "gui_surface = 0; map_surface = 0;");
+        gmData.Code.ByName("gml_Object_oControl_Step_0").ReplaceGMLInCode(
+            """
+            if surface_exists(gui_surface)
+            {
+                surface_set_target(gui_surface)
+            """,
+            """
+            if surface_exists(map_surface)
+            {
+                if (surface_get_width(map_surface) != (320 + widescreen_space))
+                    surface_free(map_surface)
+            }
+            if (!surface_exists(map_surface))
+                map_surface = surface_create((320 + widescreen_space), 240)
+            if surface_exists(gui_surface)
+            {
+                surface_set_target(gui_surface)
+            """
+            );
+        gmData.Code.ByName("gml_Script_draw_gui").ReplaceGMLInCode("draw_gui_map((276 + widescreen_space), 0)", "{ surface_set_target(map_surface); draw_gui_map((276 + widescreen_space), 0); surface_reset_target(); }");
+        gmData.Code.ByName("gml_Object_oControl_Draw_64").ReplaceGMLInCode("d = application_get_position()", """
+            d = application_get_position();
+            if surface_exists(map_surface)
+            {
+                surface_set_target(gui_surface)
+                var xPos = 0;
+                var yPos = 0;
+                var xScale = 1;
+                var yScale = 1;
+                if (global.flipGameHorizontally)
+                {
+                    xPos = ((320 + widescreen_space) * 2 - 48);
+                    xScale = -1;
+                }
+                if (global.flipGameVertically)
+                {
+                    yPos = 32;
+                    yScale = -1;
+                }
+                draw_surface_ext(map_surface, xPos, yPos, xScale, yScale, 0, c_white, 1)
+                surface_reset_target()
+            }
+            """);
+
+        // Invert controls if in inverted rooms.
+        gmData.Code.ByName("gml_Object_oControl_Step_0").ReplaceGMLInCode("global_control()",
+            """
+            {
+                if (!(room == rm_loading || room == rm_controller || room == titleroom || room == rm_gameplay || room == rm_options || room == rm_gallery || room == rm_credits))
+                {
+                    // if flipped horizontal
+                    var tempCtrl = 0;
+                    if (global.flipGameHorizontally)
+                    {
+                        tempCtrl = ctrl_Left;
+                        ctrl_Left = ctrl_Right;
+                        ctrl_Right = tempCtrl;
+                    }
+                    // if flipped vertical
+                    if (global.flipGameVertically)
+                    {
+                        tempCtrl = ctrl_Up;
+                        ctrl_Up = ctrl_Down;
+                        ctrl_Down = tempCtrl;
+                    }
+                }
+                global_control();
+            }
+            """);
+    }
+}